package com.wlcorp.forcazamis.sys.util;


/**
 *  
 ************************************************
 * @file: Encryptor.java
 * @Copyright: 2007 HundSun Electronics Co.,Ltd.
 * All right reserved.
 ************************************************
 * @package: com.hs.cccecity.sys.utils
 * @class: Encryptor
 * @description: 
 * 
 * @author: huangjb
 * @since: May 16, 2007-5:33:52 PM
 * @history: 
 *	$Id: Encryptor.java,v 1.1 2007/08/09 00:46:22 lilz Exp $
 */
public class Encryptor {
  protected static final int BLOCK_SIZE = 8;

  private int[] workingKey = null;

  private byte[] userkey = null;

  /**
   * standard constructor.
   */
  public Encryptor(byte[] userkey) {
    this.userkey = userkey;
  }

  /**
   * initialise a DES cipher.
   *
   * @param forEncryption whether or not we are for encryption.
   * @param params the parameters required to set up the cipher.
   * @exception IllegalArgumentException if the params argument is
   * inappropriate.
   */
  public void init(boolean encrypting, byte[] key) {
    if (key != null) {
      workingKey = generateWorkingKey(encrypting, key);
      return;
    }

    else {
      throw new IllegalArgumentException(
          "invalid parameter passed to DES init - ");
    }
  }

  public int getBlockSize() {
    return BLOCK_SIZE;
  }

  /**
   * <p>it used to check the parameters and then call desfun()</p>
   */
  public int processBlock(
      byte[] in,
      int inOff,
      byte[] out,
      int outOff) {
    if (workingKey == null) {
      throw new IllegalStateException("DES engine not initialised");
    }

    if ( (inOff + BLOCK_SIZE) > in.length) {
      throw new IllegalStateException("input buffer too short");
    }

    if ( (outOff + BLOCK_SIZE) > out.length) {
      throw new IllegalStateException("output buffer too short");
    }

    desFunc(workingKey, in, inOff, out, outOff);

    return BLOCK_SIZE;
  }

  /**
   * what follows is mainly taken from "Applied Cryptography", by
   * Bruce Schneier, however it also bears great resemblance to Richard
   * Outerbridge's D3DES...
   */

  static short[] Df_Key = {
      0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef,
      0xfe, 0xdc, 0xba, 0x98, 0x76, 0x54, 0x32, 0x10,
      0x89, 0xab, 0xcd, 0xef, 0x01, 0x23, 0x45, 0x67
  };

  static short[] bytebit = {
      0200, 0100, 040, 020, 010, 04, 02, 01
  };

  static int[] bigbyte = {
      0x800000, 0x400000, 0x200000, 0x100000,
      0x80000, 0x40000, 0x20000, 0x10000,
      0x8000, 0x4000, 0x2000, 0x1000,
      0x800, 0x400, 0x200, 0x100,
      0x80, 0x40, 0x20, 0x10,
      0x8, 0x4, 0x2, 0x1
  };

  /*
   * Use the key schedule specified in the Standard (ANSI X3.92-1981).
   */

  static byte[] pc1 = {
      56, 48, 40, 32, 24, 16, 8, 0, 57, 49, 41, 33, 25, 17,
      9, 1, 58, 50, 42, 34, 26, 18, 10, 2, 59, 51, 43, 35,
      62, 54, 46, 38, 30, 22, 14, 6, 61, 53, 45, 37, 29, 21,
      13, 5, 60, 52, 44, 36, 28, 20, 12, 4, 27, 19, 11, 3
  };

  static byte[] totrot = {
      1, 2, 4, 6, 8, 10, 12, 14,
      15, 17, 19, 21, 23, 25, 27, 28
  };

  static byte[] pc2 = {
      13, 16, 10, 23, 0, 4, 2, 27, 14, 5, 20, 9,
      22, 18, 11, 3, 25, 7, 15, 6, 26, 19, 12, 1,
      40, 51, 30, 36, 46, 54, 29, 39, 50, 44, 32, 47,
      43, 48, 38, 55, 33, 52, 45, 41, 49, 35, 28, 31
  };

  static int[] SP1 = {
      0x01010400, 0x00000000, 0x00010000, 0x01010404,
      0x01010004, 0x00010404, 0x00000004, 0x00010000,
      0x00000400, 0x01010400, 0x01010404, 0x00000400,
      0x01000404, 0x01010004, 0x01000000, 0x00000004,
      0x00000404, 0x01000400, 0x01000400, 0x00010400,
      0x00010400, 0x01010000, 0x01010000, 0x01000404,
      0x00010004, 0x01000004, 0x01000004, 0x00010004,
      0x00000000, 0x00000404, 0x00010404, 0x01000000,
      0x00010000, 0x01010404, 0x00000004, 0x01010000,
      0x01010400, 0x01000000, 0x01000000, 0x00000400,
      0x01010004, 0x00010000, 0x00010400, 0x01000004,
      0x00000400, 0x00000004, 0x01000404, 0x00010404,
      0x01010404, 0x00010004, 0x01010000, 0x01000404,
      0x01000004, 0x00000404, 0x00010404, 0x01010400,
      0x00000404, 0x01000400, 0x01000400, 0x00000000,
      0x00010004, 0x00010400, 0x00000000, 0x01010004
  };

  static int[] SP2 = {
      0x80108020, 0x80008000, 0x00008000, 0x00108020,
      0x00100000, 0x00000020, 0x80100020, 0x80008020,
      0x80000020, 0x80108020, 0x80108000, 0x80000000,
      0x80008000, 0x00100000, 0x00000020, 0x80100020,
      0x00108000, 0x00100020, 0x80008020, 0x00000000,
      0x80000000, 0x00008000, 0x00108020, 0x80100000,
      0x00100020, 0x80000020, 0x00000000, 0x00108000,
      0x00008020, 0x80108000, 0x80100000, 0x00008020,
      0x00000000, 0x00108020, 0x80100020, 0x00100000,
      0x80008020, 0x80100000, 0x80108000, 0x00008000,
      0x80100000, 0x80008000, 0x00000020, 0x80108020,
      0x00108020, 0x00000020, 0x00008000, 0x80000000,
      0x00008020, 0x80108000, 0x00100000, 0x80000020,
      0x00100020, 0x80008020, 0x80000020, 0x00100020,
      0x00108000, 0x00000000, 0x80008000, 0x00008020,
      0x80000000, 0x80100020, 0x80108020, 0x00108000
  };

  static int[] SP3 = {
      0x00000208, 0x08020200, 0x00000000, 0x08020008,
      0x08000200, 0x00000000, 0x00020208, 0x08000200,
      0x00020008, 0x08000008, 0x08000008, 0x00020000,
      0x08020208, 0x00020008, 0x08020000, 0x00000208,
      0x08000000, 0x00000008, 0x08020200, 0x00000200,
      0x00020200, 0x08020000, 0x08020008, 0x00020208,
      0x08000208, 0x00020200, 0x00020000, 0x08000208,
      0x00000008, 0x08020208, 0x00000200, 0x08000000,
      0x08020200, 0x08000000, 0x00020008, 0x00000208,
      0x00020000, 0x08020200, 0x08000200, 0x00000000,
      0x00000200, 0x00020008, 0x08020208, 0x08000200,
      0x08000008, 0x00000200, 0x00000000, 0x08020008,
      0x08000208, 0x00020000, 0x08000000, 0x08020208,
      0x00000008, 0x00020208, 0x00020200, 0x08000008,
      0x08020000, 0x08000208, 0x00000208, 0x08020000,
      0x00020208, 0x00000008, 0x08020008, 0x00020200
  };

  static int[] SP4 = {
      0x00802001, 0x00002081, 0x00002081, 0x00000080,
      0x00802080, 0x00800081, 0x00800001, 0x00002001,
      0x00000000, 0x00802000, 0x00802000, 0x00802081,
      0x00000081, 0x00000000, 0x00800080, 0x00800001,
      0x00000001, 0x00002000, 0x00800000, 0x00802001,
      0x00000080, 0x00800000, 0x00002001, 0x00002080,
      0x00800081, 0x00000001, 0x00002080, 0x00800080,
      0x00002000, 0x00802080, 0x00802081, 0x00000081,
      0x00800080, 0x00800001, 0x00802000, 0x00802081,
      0x00000081, 0x00000000, 0x00000000, 0x00802000,
      0x00002080, 0x00800080, 0x00800081, 0x00000001,
      0x00802001, 0x00002081, 0x00002081, 0x00000080,
      0x00802081, 0x00000081, 0x00000001, 0x00002000,
      0x00800001, 0x00002001, 0x00802080, 0x00800081,
      0x00002001, 0x00002080, 0x00800000, 0x00802001,
      0x00000080, 0x00800000, 0x00002000, 0x00802080
  };

  static int[] SP5 = {
      0x00000100, 0x02080100, 0x02080000, 0x42000100,
      0x00080000, 0x00000100, 0x40000000, 0x02080000,
      0x40080100, 0x00080000, 0x02000100, 0x40080100,
      0x42000100, 0x42080000, 0x00080100, 0x40000000,
      0x02000000, 0x40080000, 0x40080000, 0x00000000,
      0x40000100, 0x42080100, 0x42080100, 0x02000100,
      0x42080000, 0x40000100, 0x00000000, 0x42000000,
      0x02080100, 0x02000000, 0x42000000, 0x00080100,
      0x00080000, 0x42000100, 0x00000100, 0x02000000,
      0x40000000, 0x02080000, 0x42000100, 0x40080100,
      0x02000100, 0x40000000, 0x42080000, 0x02080100,
      0x40080100, 0x00000100, 0x02000000, 0x42080000,
      0x42080100, 0x00080100, 0x42000000, 0x42080100,
      0x02080000, 0x00000000, 0x40080000, 0x42000000,
      0x00080100, 0x02000100, 0x40000100, 0x00080000,
      0x00000000, 0x40080000, 0x02080100, 0x40000100
  };

  static int[] SP6 = {
      0x20000010, 0x20400000, 0x00004000, 0x20404010,
      0x20400000, 0x00000010, 0x20404010, 0x00400000,
      0x20004000, 0x00404010, 0x00400000, 0x20000010,
      0x00400010, 0x20004000, 0x20000000, 0x00004010,
      0x00000000, 0x00400010, 0x20004010, 0x00004000,
      0x00404000, 0x20004010, 0x00000010, 0x20400010,
      0x20400010, 0x00000000, 0x00404010, 0x20404000,
      0x00004010, 0x00404000, 0x20404000, 0x20000000,
      0x20004000, 0x00000010, 0x20400010, 0x00404000,
      0x20404010, 0x00400000, 0x00004010, 0x20000010,
      0x00400000, 0x20004000, 0x20000000, 0x00004010,
      0x20000010, 0x20404010, 0x00404000, 0x20400000,
      0x00404010, 0x20404000, 0x00000000, 0x20400010,
      0x00000010, 0x00004000, 0x20400000, 0x00404010,
      0x00004000, 0x00400010, 0x20004010, 0x00000000,
      0x20404000, 0x20000000, 0x00400010, 0x20004010
  };

  static int[] SP7 = {
      0x00200000, 0x04200002, 0x04000802, 0x00000000,
      0x00000800, 0x04000802, 0x00200802, 0x04200800,
      0x04200802, 0x00200000, 0x00000000, 0x04000002,
      0x00000002, 0x04000000, 0x04200002, 0x00000802,
      0x04000800, 0x00200802, 0x00200002, 0x04000800,
      0x04000002, 0x04200000, 0x04200800, 0x00200002,
      0x04200000, 0x00000800, 0x00000802, 0x04200802,
      0x00200800, 0x00000002, 0x04000000, 0x00200800,
      0x04000000, 0x00200800, 0x00200000, 0x04000802,
      0x04000802, 0x04200002, 0x04200002, 0x00000002,
      0x00200002, 0x04000000, 0x04000800, 0x00200000,
      0x04200800, 0x00000802, 0x00200802, 0x04200800,
      0x00000802, 0x04000002, 0x04200802, 0x04200000,
      0x00200800, 0x00000000, 0x00000002, 0x04200802,
      0x00000000, 0x00200802, 0x04200000, 0x00000800,
      0x04000002, 0x04000800, 0x00000800, 0x00200002
  };

  static int[] SP8 = {
      0x10001040, 0x00001000, 0x00040000, 0x10041040,
      0x10000000, 0x10001040, 0x00000040, 0x10000000,
      0x00040040, 0x10040000, 0x10041040, 0x00041000,
      0x10041000, 0x00041040, 0x00001000, 0x00000040,
      0x10040000, 0x10000040, 0x10001000, 0x00001040,
      0x00041000, 0x00040040, 0x10040040, 0x10041000,
      0x00001040, 0x00000000, 0x00000000, 0x10040040,
      0x10000040, 0x10001000, 0x00041040, 0x00040000,
      0x00041040, 0x00040000, 0x10041000, 0x00001000,
      0x00000040, 0x10040040, 0x00001000, 0x00041040,
      0x10001000, 0x00000040, 0x10000040, 0x10040000,
      0x10040040, 0x10000000, 0x00040000, 0x10001040,
      0x00000000, 0x10041040, 0x00040040, 0x10000040,
      0x10040000, 0x10001000, 0x10001040, 0x00000000,
      0x10041040, 0x00041000, 0x00041000, 0x00001040,
      0x00001040, 0x00040040, 0x10000000, 0x10041000
  };

  /**
   * generate an integer based working key based on our secret key
   * and what we processing we are planning to do.
   *
   * Acknowledgements for this routine go to James Gillogly & Phil Karn.
   *         (whoever, and wherever they are!).
   */
  protected int[] generateWorkingKey(
      boolean encrypting,
      byte[] key) {
    int[] newKey = new int[32];
    boolean[] pc1m = new boolean[56],
        pcr = new boolean[56];

    for (int j = 0; j < 56; j++) {
      int l = pc1[j];

      pc1m[j] = ( (key[l >>> 3] & bytebit[l & 07]) != 0);
    }

    for (int i = 0; i < 16; i++) {
      int l, m, n;

      if (encrypting) {
        m = i << 1;
      }
      else {
        m = (15 - i) << 1;
      }

      n = m + 1;
      newKey[m] = newKey[n] = 0;

      for (int j = 0; j < 28; j++) {
        l = j + totrot[i];
        if (l < 28) {
          pcr[j] = pc1m[l];
        }
        else {
          pcr[j] = pc1m[l - 28];
        }
      }

      for (int j = 28; j < 56; j++) {
        l = j + totrot[i];
        if (l < 56) {
          pcr[j] = pc1m[l];
        }
        else {
          pcr[j] = pc1m[l - 28];
        }
      }

      for (int j = 0; j < 24; j++) {
        if (pcr[pc2[j]]) {
          newKey[m] |= bigbyte[j];
        }

        if (pcr[pc2[j + 24]]) {
          newKey[n] |= bigbyte[j];
        }
      }
    }

    //
    // store the processed key
    //
    for (int i = 0; i != 32; i += 2) {
      int i1, i2;

      i1 = newKey[i];
      i2 = newKey[i + 1];

      newKey[i] = ( (i1 & 0x00fc0000) << 6) | ( (i1 & 0x00000fc0) << 10)
          | ( (i2 & 0x00fc0000) >>> 10) | ( (i2 & 0x00000fc0) >>> 6);

      newKey[i + 1] = ( (i1 & 0x0003f000) << 12) | ( (i1 & 0x0000003f) << 16)
          | ( (i2 & 0x0003f000) >>> 4) | (i2 & 0x0000003f);
    }

    return newKey;
  }

  /**
   * the DES engine.
   */
  protected void desFunc(
      int[] wKey,
      byte[] in,
      int inOff,
      byte[] out,
      int outOff) {
    int work, right, left;

    left = (in[inOff + 0] & 0xff) << 24;
    left |= (in[inOff + 1] & 0xff) << 16;
    left |= (in[inOff + 2] & 0xff) << 8;
    left |= (in[inOff + 3] & 0xff);

    right = (in[inOff + 4] & 0xff) << 24;
    right |= (in[inOff + 5] & 0xff) << 16;
    right |= (in[inOff + 6] & 0xff) << 8;
    right |= (in[inOff + 7] & 0xff);

    work = ( (left >>> 4) ^ right) & 0x0f0f0f0f;
    right ^= work;
    left ^= (work << 4);
    work = ( (left >>> 16) ^ right) & 0x0000ffff;
    right ^= work;
    left ^= (work << 16);
    work = ( (right >>> 2) ^ left) & 0x33333333;
    left ^= work;
    right ^= (work << 2);
    work = ( (right >>> 8) ^ left) & 0x00ff00ff;
    left ^= work;
    right ^= (work << 8);
    right = ( (right << 1) | ( (right >>> 31) & 1)) & 0xffffffff;
    work = (left ^ right) & 0xaaaaaaaa;
    left ^= work;
    right ^= work;
    left = ( (left << 1) | ( (left >>> 31) & 1)) & 0xffffffff;

    for (int round = 0; round < 8; round++) {
      int fval;

      work = (right << 28) | (right >>> 4);
      work ^= wKey[round * 4 + 0];
      fval = SP7[work & 0x3f];
      fval |= SP5[ (work >>> 8) & 0x3f];
      fval |= SP3[ (work >>> 16) & 0x3f];
      fval |= SP1[ (work >>> 24) & 0x3f];
      work = right ^ wKey[round * 4 + 1];
      fval |= SP8[work & 0x3f];
      fval |= SP6[ (work >>> 8) & 0x3f];
      fval |= SP4[ (work >>> 16) & 0x3f];
      fval |= SP2[ (work >>> 24) & 0x3f];
      left ^= fval;
      work = (left << 28) | (left >>> 4);
      work ^= wKey[round * 4 + 2];
      fval = SP7[work & 0x3f];
      fval |= SP5[ (work >>> 8) & 0x3f];
      fval |= SP3[ (work >>> 16) & 0x3f];
      fval |= SP1[ (work >>> 24) & 0x3f];
      work = left ^ wKey[round * 4 + 3];
      fval |= SP8[work & 0x3f];
      fval |= SP6[ (work >>> 8) & 0x3f];
      fval |= SP4[ (work >>> 16) & 0x3f];
      fval |= SP2[ (work >>> 24) & 0x3f];
      right ^= fval;
    }

    right = (right << 31) | (right >>> 1);
    work = (left ^ right) & 0xaaaaaaaa;
    left ^= work;
    right ^= work;
    left = (left << 31) | (left >>> 1);
    work = ( (left >>> 8) ^ right) & 0x00ff00ff;
    right ^= work;
    left ^= (work << 8);
    work = ( (left >>> 2) ^ right) & 0x33333333;
    right ^= work;
    left ^= (work << 2);
    work = ( (right >>> 16) ^ left) & 0x0000ffff;
    left ^= work;
    right ^= (work << 16);
    work = ( (right >>> 4) ^ left) & 0x0f0f0f0f;
    left ^= work;
    right ^= (work << 4);

    out[outOff + 0] = (byte) ( (right >>> 24) & 0xff);
    out[outOff + 1] = (byte) ( (right >>> 16) & 0xff);
    out[outOff + 2] = (byte) ( (right >>> 8) & 0xff);
    out[outOff + 3] = (byte) (right & 0xff);
    out[outOff + 4] = (byte) ( (left >>> 24) & 0xff);
    out[outOff + 5] = (byte) ( (left >>> 16) & 0xff);
    out[outOff + 6] = (byte) ( (left >>> 8) & 0xff);
    out[outOff + 7] = (byte) (left & 0xff);
  }

  /**
   *	encrypt the data
   *	@param byte[]
   *	@return byte[]
   */
  public byte[] encrypt(byte[] idata) {
    if (idata == null || idata.length == 0) {
      return null;
    }

    init(true, userkey);

    int processTimes = idata.length / BLOCK_SIZE;
    int leftdata = idata.length % BLOCK_SIZE;
    int olen = 0;
    byte[] buf = new byte[BLOCK_SIZE * (processTimes + 1)];

    for (int i = 0; i < processTimes; i++) {
      olen = i * BLOCK_SIZE;
      processBlock(idata, olen, buf, olen);
    }

    olen += BLOCK_SIZE;

    if (leftdata != 0) {

      byte[] temp = new byte[BLOCK_SIZE];
      for (int j = 0; j < leftdata; j++) {
        temp[j] = idata[j + olen];
      }
      for (int k = leftdata; k < BLOCK_SIZE; k++) {
        temp[k] = (byte) (BLOCK_SIZE - leftdata);
      }
      processBlock(temp, 0, buf, olen);
      olen += BLOCK_SIZE;
    }

    byte[] result = new byte[olen];
    for (int j = 0; j < olen; j++) {
      result[j] = buf[j];
    }
    return result;
  }

  /**
   * 	decrypt the data
   *	@param byte[]
   *	@return byte[]
   */
  public byte[] decrypt(byte[] idata) {
    if (idata == null || idata.length == 0) {
      return null;
    }
    init(false, userkey);

    int processTimes = idata.length / BLOCK_SIZE;
    int leftdata = idata.length % BLOCK_SIZE;

    if (leftdata != 0) {
      throw new IllegalStateException("input not BLOCK_SIZE times");
    }

    int olen = 0;
    byte[] buf = new byte[idata.length];

    for (int i = 0; i < processTimes; i++) {
      olen = i * BLOCK_SIZE;
      processBlock(idata, olen, buf, olen);
    }

    byte bt;
    for (int j = 1; j < BLOCK_SIZE; j++) {
      bt = buf[olen + j];
      int k = j;
      for (; k < BLOCK_SIZE; k++) {
        if (bt != buf[olen + k]) {
          break;
        }
      }
      if (k == BLOCK_SIZE) {
        if (j == BLOCK_SIZE - bt) {

          olen = olen + j;
          break;
        }
        else if (j == BLOCK_SIZE - 1) {
          olen += BLOCK_SIZE;
        }
      }
    }

    byte[] odata = new byte[olen];

    for (int k = 0; k < olen; k++) {
      odata[k] = buf[k];
    }
    return odata;
  }
}
